Answer: Double.
- A Same
- B Half
- C Double
- D Four times
Correct answer: C. Double
Explanation: KE = (1/2)mv<sup>2.</sup> If m doubles, KE doubles (assuming same v).
As a pendulum swings, total mechanical energy (KE+PE) stays constant: at the highest points A and C, all energy is potential (zero speed); at the lowest point B, all of that energy has converted into kinetic energy (maximum speed).
Concept context
Work-energy theorem, potential energy, conservation of energy, collisions.